If I want to return to the factory IOS and configurations of the AP only, I must issue this command:
service-module wlan-ap0 reset default-config
But which IOS is going to replace the current?
I think that will only reset your configuration so the IOS should be the same as the one running on the device when you issue the command.
This link helped me out. Creating a bridge from the Host Router to the Integrated AP allowed me to copy files from the host routers flash via TFTP. http://rickysnetworkblog.blogspot.com.au/2016/03/ios-recovery-on-embedded-ap-in-cisco.html